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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Jun. 30, 2012
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Condensed Consolidated Statements Of Cash Flows Parenthetical |  |
Allowance for Funds Used During Construction | $ 45 | $ 103

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- Definition AFUDC is a component of construction costs representing net cost of borrowed funds and a reasonable rate on other funds used during the period of construction. + References No definition available. + Details
Name: | msex_AllowanceForFundsUsedDuringConstruction
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | msex_StatementsOfCashFlowsParentheticalAbstract
Namespace Prefix: | msex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration